diff --git a/docs/serving/samples/hello-world/helloworld-kotlin/Dockerfile b/docs/serving/samples/hello-world/helloworld-kotlin/Dockerfile
index df8e96e32..6cb717365 100644
--- a/docs/serving/samples/hello-world/helloworld-kotlin/Dockerfile
+++ b/docs/serving/samples/hello-world/helloworld-kotlin/Dockerfile
@@ -1,6 +1,6 @@
 # Use the official gradle image to create a build artifact.
 # https://hub.docker.com/_/gradle
-FROM gradle as builder
+FROM gradle:4.10 as builder
 
 # Copy local code to the container image.
 COPY build.gradle .